firefox@esr

Install command: 
brew install --cask firefox@esr

Names: Mozilla Firefox ESR, Mozilla Firefox Extended Support Release

Web browser

https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr

Development: Pull requests

Cask JSON API: /api/cask/firefox@esr.json

Cask code: firefox@esr.rb on GitHub

Current version: 140.14.0

Requirements: macOS

Conflicts with casks:

firefox 154.0 Web browser Mozilla Firefox
firefox@beta 155.0b4 Web browser Mozilla Firefox Beta
firefox@cn 116.0 Chinese version of Firefox firefox-cn

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